package com.zhn.shortlink.admin.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.lang.UUID;
import com.alibaba.fastjson2.JSON;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zhn.shortlink.admin.common.convention.exception.ClientException;
import com.zhn.shortlink.admin.dao.entity.UserDO;
import com.zhn.shortlink.admin.dao.mapper.UserMapper;
import com.zhn.shortlink.admin.dto.req.UserLoginReqDTO;
import com.zhn.shortlink.admin.dto.req.UserRegisterReqDTO;
import com.zhn.shortlink.admin.dto.req.UserUpdateReqDTO;
import com.zhn.shortlink.admin.dto.resp.UserActualRespDTO;
import com.zhn.shortlink.admin.dto.resp.UserLoginRespDTO;
import com.zhn.shortlink.admin.dto.resp.UserRespDTO;
import com.zhn.shortlink.admin.service.GroupService;
import com.zhn.shortlink.admin.service.UserService;
import lombok.RequiredArgsConstructor;
import org.redisson.api.RBloomFilter;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.BeanUtils;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.zhn.shortlink.admin.common.constant.RedisCacheConstant.LOCK_USER_REGISTER_KEY;
import static com.zhn.shortlink.admin.common.constant.RedisCacheConstant.USER_LOGIN_KEY;
import static com.zhn.shortlink.admin.common.enums.UserErrorCode.*;

/**
 * 用户接口实现层
 */
@RequiredArgsConstructor
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, UserDO> implements UserService {

    private final RBloomFilter<String> userRegisterCachePenetrationBloomFilter;
    private final RedissonClient redissonClient;
    private final StringRedisTemplate stringRedisTemplate;
    private final GroupService groupService;
    public UserRespDTO getUserByUserName(String userName){
        LambdaQueryWrapper<UserDO> queryWrapper = Wrappers.lambdaQuery(UserDO.class)
                .eq(UserDO::getUsername, userName);
        UserDO userDO = baseMapper.selectOne(queryWrapper);
        if(userDO == null){
            throw new ClientException(USER_NULL);
        }
        UserRespDTO result = new UserRespDTO();
        BeanUtils.copyProperties(userDO,result);
        return result;
    }

    @Override
    public UserActualRespDTO getActualUserByUserName(String userName) {
        LambdaQueryWrapper<UserDO> queryWrapper = Wrappers.lambdaQuery(UserDO.class)
                .eq(UserDO::getUsername, userName);
        UserDO userDO = baseMapper.selectOne(queryWrapper);
        if(userDO == null){
            throw new ClientException(USER_NULL);
        }
        UserActualRespDTO result = new UserActualRespDTO();
        BeanUtils.copyProperties(userDO,result);
        return result;
    }

    @Override
    public Boolean hasUsername(String username) {
        return !userRegisterCachePenetrationBloomFilter.contains(username);
    }

    /**
     * 用户注册功能
     * 可以防止缓存穿透
     * 防止大量请求去请求未注册的用户名
     * @param requestParam
     */
    @Override
    public void register(UserRegisterReqDTO requestParam) {
        if(!hasUsername(requestParam.getUsername())){
            throw new ClientException(USER_NAME_EXIST);
        }
        RLock lock = redissonClient.getLock(LOCK_USER_REGISTER_KEY + requestParam.getUsername());
        try {
            boolean flag = lock.tryLock();
            if(flag){
                int insert = 0;
                try {
                    insert = baseMapper.insert(BeanUtil.copyProperties(requestParam, UserDO.class));
                    if(insert < 1){
                        throw new ClientException(USER_SAVE_ERROR);
                    }
                } catch (DuplicateKeyException e) {
                    throw new ClientException(USER_NAME_EXIST);
                }
                userRegisterCachePenetrationBloomFilter.add(requestParam.getUsername());
                groupService.saveGroup(requestParam.getUsername(),"默认分组");
                return;
            }
            throw new ClientException(USER_EXIST);
        }finally {
            lock.unlock();
        }
    }

    @Override
    public void updateUser(UserUpdateReqDTO requestParam) {
        //TODO 验证当前用户是否为登录用户
        LambdaUpdateWrapper<UserDO> queryWrapper = Wrappers.lambdaUpdate(UserDO.class)
                .eq(UserDO::getUsername, requestParam.getUsername());
        baseMapper.update(BeanUtil.copyProperties(requestParam,UserDO.class),queryWrapper);
    }

    @Override
    public UserLoginRespDTO login(UserLoginReqDTO requestParam) {
        LambdaQueryWrapper<UserDO> queryWrapper = Wrappers.lambdaQuery(UserDO.class)
                .eq(UserDO::getUsername, requestParam.getUsername())
                .eq(UserDO::getPassword, requestParam.getPassword())
                .eq(UserDO::getDelFlag,0);
        UserDO userDO = baseMapper.selectOne(queryWrapper);
        if(userDO == null){
            throw new ClientException("用户不存在=====");
        }
        Map<Object, Object> hasLoginMap = stringRedisTemplate.opsForHash().entries(USER_LOGIN_KEY + requestParam.getUsername());
        if (CollUtil.isNotEmpty(hasLoginMap)) {
            stringRedisTemplate.expire(USER_LOGIN_KEY + requestParam.getUsername(), 30L, TimeUnit.MINUTES);
            String token = hasLoginMap.keySet().stream()
                    .findFirst()
                    .map(Object::toString)
                    .orElseThrow(() -> new ClientException("用户登录错误"));
            return new UserLoginRespDTO(token);
        }
        /**
         * Hash
         * Key：login_用户名
         * Value：
         *  Key：token标识
         *  Val：JSON 字符串（用户信息）
         */
        String uuid = UUID.randomUUID().toString();
        stringRedisTemplate.opsForHash().put(USER_LOGIN_KEY + requestParam.getUsername(), uuid, JSON.toJSONString(userDO));
        stringRedisTemplate.expire(USER_LOGIN_KEY + requestParam.getUsername(), 30L, TimeUnit.MINUTES);
        return new UserLoginRespDTO(uuid);
    }

    @Override
    public Boolean checkLogin(String username,String token) {
        return stringRedisTemplate.opsForHash().get("login_"+username,token) != null;
    }

    @Override
    public void logout(String username, String token) {
        if(checkLogin(username,token)){
            stringRedisTemplate.delete("login_" + username);
            return;
        }
        throw new ClientException("用户未登录或者用户token不存在");
    }
}
